CVE-2026-80750 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users of Linux-based systems, should review and apply the provided kernel patches to fix the vulnerability. They should also update Linux kernel to the latest version and monitor system logs for potential exploitation attempts. Additionally, they should review compensating controls for exposed systems while remediation is scheduled and verified.

Technical summary

The vulnerability exists in the Linux kernel, specifically in the pmdomain: mediatek component. It has been resolved by fixing the remaining %pOF after of_node_put(). The scpsys_get_bus_protection_legacy() function looks up several legacy bus protection regmaps from device-tree nodes. Two error paths put the device node before checking whether the regmap lookup failed, but still pass that node to dev_err_probe() with %pOF on failure. If of_node_put() drops the last reference, the later %pOF formatting can dereference a freed device node.

Defensive priority

Linux kernel vulnerability with high CVSS score of 8.4, requiring immediate attention.

Recommended defensive actions

• Review and apply the provided kernel patches to fix the vulnerability
• Update Linux kernel to the latest version
• Monitor system logs for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability exists in the Linux kernel, specifically in the pmdomain: mediatek component. It has been resolved by fixing the remaining %pOF after of_node_put(). The scpsys_get_bus_protection_legacy() function looks up several legacy bus protection regmaps from device-tree nodes. Two error paths put the device node before checking whether the regmap lookup failed, but still pass that node to dev_err_probe() with %pOF on failure. If of_node_put() drops the last reference, the later %pOF formatting can dereference a freed device node. Evidence is limited, and defenders should verify the provided kernel patches and update Linux kernel to the latest version.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.